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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70752bab6e5ce11a48e9b91b4c1610b90a18f27ec23623fbbc8cf6f9eab4095a' 
  AND token = 'ekIpkswg7l1XWSQy58WHLr1q/D+cOhCl/XFbmUAWhJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}